有没有办法通过Delphi的Websense服务器进行身份验证?

回答我自己的问题;这对我很有用。

只有当您希望通过验证让MSN/Live Messenger通过时,才需要自定义用户代理字符串, as described under "notes" at the end of this article.

在命令行应用程序中:

uses
  ... IdHTTP ...;

...
var
  httpGetter: TIdHTTP;
...    
httpGetter.Request.Username := username;
httpGetter.Request.Password := password;
httpGetter.HandleRedirects := True;
httpGetter.Request.BasicAuthentication := True;

//custom useragent required to let live messenger work
httpGetter.Request.UserAgent := 'MSN Explorer/9.0 (MSN 8.0; TmstmpExt)';

httpGetter.Get(url,MS);
...

我将尝试HTTP身份验证

http://en.wikipedia.org/wiki/Basic_access_authentication